Yes of course. I see what you mean. But as I say, I've been pondering on this recently.
There actually is quite a lot of difference between 4x5 and 5x7, or 5x8. It varies as the area, versus the length or width.
I like the 4x5 aspect ratio, so I would compare 4x5 versus 5x6.25. In area, that's 20 inXin versus 31.25 inXin, a 56% increase in area. That's substantial.
If one likes the 5x8 aspect ratio, then one compares 3.125x5 vs. 5x8. In area, it's 15.625 inXin versus 40 inXin, which is a 256% increase in area.
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